6. TSHD: TRAILING SUCTION HOPPER DREDGER

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1 6. TSHD: TRAILING SUCTION HOPPER DREDGER BY PAUL VERCRUIJSSE Trailing Suction Hopper Dredger Chapter 6 - Trailing Suction Hopper Dredger - p. 1

2 Trailing Suction Hopper Dredger Jumbo 30,000 m 3 Small & Jumbo, 975 m 3 & 23,000 m 3 Mid-size, 4000 m 3 Trailing Suction Hopper Dredger Main characteristics Most important parts of the dredger Process description Production limiting factors Some characteristic figures Chapter 6 - Trailing Suction Hopper Dredger - p. 2

3 Trailing Suction Hopper Dredger Main characteristics Free sailing Self-propelled Self-loading when trailing Self-unloading or -discharging Seagoing or inland waterway vessel All non-rock type soils Relatively insensitive for waves Not vulnerable for shipping Trailing Suction Hopper Dredger wheel house service crane swell compensator propulsion engine room hopper suction pipe pump room draghead - 70m bow-coupling for pumping ashore or rainbowing Chapter 6 - Trailing Suction Hopper Dredger - p. 3

4 Trailing Suction Hopper Dredger Most important parts, machinery Dragheads Dredge pump(s) Hopper, loading and unloading system TSHD Process Description Dredging cycle Loading at the dredging- or borrow area Sailing (loaded) to the unloading area Unloading (bottom opening or pumping) Sailing (empty) to the dredging area Chapter 6 - Trailing Suction Hopper Dredger - p. 4

5 TSHD Process Dredging cycle 1,2,3 Loading at the dredging / borrow area 4 Sailing (loaded) to the unloading area Unloading (bottom doors or by pumping) Sailing (empty) to the dredging area 1 6 TSHD Process Description Excavation (Erosion & Cutting) Chapter 6 - Trailing Suction Hopper Dredger - p. 5

6 TSHD Process Description Suction TSHD Process Description Loading Loading (overflow) Chapter 6 - Trailing Suction Hopper Dredger - p. 6

7 TSHD Process Description Loading: Basic Principle Top view hopper Longitudinal section TSHD Process Description Full Load: Basic Principle Top view hopper Longitudinal section Chapter 6 - Trailing Suction Hopper Dredger - p. 7

8 Hopper loading (mud) Total Volume [m3] Max. volume Draught [m] (=tons) Max. draught Mud [m 3 ] Hopper loading (sand) Total Volume [m 3 ] Max. volume Draught [m] (=tons) Max. draught Sand [m3] Overflow losses Chapter 6 - Trailing Suction Hopper Dredger - p. 8

9 TSHD Process Description Sailing loaded TSHD Process Description Discharge Chapter 6 - Trailing Suction Hopper Dredger - p. 9

10 TSHD Process Description Hopper Bottom Discharge Split-hopper TSHD Process Description Hopper Self-discharge: system Water Jets Sand Jets Jets Discharge Water inlet Dredge pump Chapter 6 - Trailing Suction Hopper Dredger - p. 10

11 TSHD Process Description Hopper Self-discharge: system Jets Jets Jets Discharge Water inlet Dredge pump TSHD Process Description Hopper Self-discharge: system Jets Jets Jets Discharge Water inlet Dredge pump Chapter 6 - Trailing Suction Hopper Dredger - p. 11

12 TSHD Process Description Hopper Self-discharge: system Jets Jets Jets Discharge Water inlet Dredge pump TSHD Process Description Hopper Self-discharge: rainbow Rainbowing Chapter 6 - Trailing Suction Hopper Dredger - p. 12

13 TSHD Process Description Hopper Self-discharge: Pump ashore TSHD Process Description Sailing empty Chapter 6 - Trailing Suction Hopper Dredger - p. 13

14 TSHD Load Graph (emptying by bottom door disposal) DRAUGHT (m) TOTAL LOAD (ton) start overflow stop loading sailing loaded VOLUME SAND (m3) emptying hopper sailing empty next trip TIME IN MINUTES start dredging Cycle-time per trip TSHD Load Graph (discharging to shore) DRAUGHT (m) start overflow stop loading sailing loaded unloading hopper next trip VOLUME SAND (m3) sailing empty TIME IN MINUTES start dredging Cycle-time per trip Chapter 6 - Trailing Suction Hopper Dredger - p. 14

15 Trailing Suction Hopper Dredger Process related topics The hull The hopper Dragheads, suction pipes and belongings Centrifugal pumps Trailing Suction Hopper Dredger The hull Sailing characteristics Resistance Small keel clearance Maximum carrying capacity versus draft, length and width Strength Stability Chapter 6 - Trailing Suction Hopper Dredger - p. 15

16 Trailing Suction Hopper Dredger The hopper Carrying capacity Volume Weight Filling system Overflow system Bottom door disposal system Self-discharge system Hopper: carrying capacity Restriction by volume (full hopper) Restriction by weight (max. draught) MUD 5,000 m3 6,000 ton HOPPER HULL Low density soils e.g.: Mud ton/m 3 5,000 x 1.2 = 6,000 ton SAND 3,500 m 3 7,000 ton HOPPER HULL High density soils e.g.: Sand ton/m 3 3,500 x 2.0 = 7,000 ton Chapter 6 - Trailing Suction Hopper Dredger - p. 16

17 Hopper: loading & dumping facilities Overflow System Bottom-doors Conical bottom-valves Dragheads Chapter 6 - Trailing Suction Hopper Dredger - p. 17

18 Sand Draghead Draghead Different dragheads Chapter 6 - Trailing Suction Hopper Dredger - p. 18

19 Suction Pipe The drag heads Draghead 2 Chapter 6 - Trailing Suction Hopper Dredger - p. 19

20 Workability Weather Delay Swell Compensator Swell Compensator Draghead Winch Oil Draghead Pressure Jar Seabottom Chapter 6 - Trailing Suction Hopper Dredger - p. 20

21 Centrifugal Pumps Hardware Types & sizes Basic parts inboard pump under water pump Centrifugal Pumps Working principle Energy Distribution Propulsion Pumps Boardnet Centrifugal pump Chapter 6 - Trailing Suction Hopper Dredger - p. 21

22 Centrifugal Pumps Density & velocity meter Engine-room with 2 pumps in line TSHD Chapter 6 - Trailing Suction Hopper Dredger - p. 22

23 Trailing Suction Hopper Dredger Production limiting factors Soil characteristics Available propulsion power Drag head size and weight Keel clearance when loaded Dredging depth Pumping distance (pump- and pump drive characteristics) Waves and currents Dirt and debris Production may vary a lot due to these factors Limiting factors A drag head grid damaged by boulders Chapter 6 - Trailing Suction Hopper Dredger - p. 23

24 Limiting factors Dirt and debris Trailing Suction Hopper Dredger Characteristic Figures trailing suction small mid-size large hopper dredger dimensions (L*W*Dr) 55*10*4 m 90*18*7 m 130*23*9 m max. dredging m m m depth hopper capacity <4,000 m3 <8,000 m3 <15,000 m3 sailing speed 8 knots 12 knots 14 knots propulsion power 400 kw 3,500 kw 8,000 kw diam. suction-pipe m 0.80 m m Chapter 6 - Trailing Suction Hopper Dredger - p. 24

25 Trailing Suction Hopper Dredger Characteristic Figures trailing suction jumbo mega hopper dredger dimensions 180*32*13 m 225 x 38 x m (L*W*Dr) max. dredging m m depth hopper capacity <30,000 m3 30,000-46,000 m3 sailing speed 17 knots knots propulsion power (while dredging) 18,000 kw 26,000 kw diam. suction-pipe 1.20 m m Chapter 6 - Trailing Suction Hopper Dredger - p. 25

26 Centrifugal Pumps Working principle 6 Bar 3 Bar 0 Bar -1 Bar Chapter 6 - Trailing Suction Hopper Dredger - p. 26

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